Blind SNR estimation for QAM constellations based on the signal magnitude statistics

Stefanos Dris; Christos Spatharakis; Paraskevas Bakopoulos; Ioannis Lazarou; Hercules Avramopoulos

doi:10.1117/12.2034532

1 February 2014 Blind SNR estimation for QAM constellations based on the signal magnitude statistics

Stefanos Dris, Christos Spatharakis, Paraskevas Bakopoulos, Ioannis Lazarou, Hercules Avramopoulos

Proceedings Volume 9009, Next-Generation Optical Communication: Components, Sub-Systems, and Systems III; 900905 (2014) https://doi.org/10.1117/12.2034532
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We present a novel non-data-aided algorithm that uses only the magnitude of the received signal for accurate estimation of the signal-to-noise ratio (SNR) in M-QAM optical coherent digital receivers. The Koay inversion method that only works with constant-modulus signals, is extended through analytically exact expressions so as to allow application to any multi-level, complex modulation scheme. Performance is evaluated via simulation for formats up to 64-QAM and is shown to be superior than the decision-directed error vector magnitude (EVM) method at low SNR, while outperforming schemes based on the method of moments at high SNR.

Citation Download Citation

Stefanos Dris, Christos Spatharakis, Paraskevas Bakopoulos, Ioannis Lazarou, and Hercules Avramopoulos "Blind SNR estimation for QAM constellations based on the signal magnitude statistics", Proc. SPIE 9009, Next-Generation Optical Communication: Components, Sub-Systems, and Systems III, 900905 (1 February 2014); https://doi.org/10.1117/12.2034532

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